NOTES:Other carbon dioxide emissions are from
motorcycles, pipelines, and lubricants. International bunker fuel emissions (not included in the total) result from the
combustion of fuels purchased in the United States but used for international
aviation and maritime transportation.
Thus, Aircraft and Ships and boats data included in U.S. Total
emissions involve only domestic activities of these modes as do all other
data shown. Aircraft emissions consist of emissions from all jet fuel (less bunker
fuels) and aviation gas consumption. Alternative-fuel vehicle emissions are
allocated to the specific vehicle types in which they were classified (i.e., Passenger cars, Light-duty
trucks, All other trucks, and Buses).